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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Peter Kelly (pmk (at) post.com)
      5  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      6  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #include "config.h"
     25 #include "Attribute.h"
     26 
     27 #include "Attr.h"
     28 #include "Element.h"
     29 #include <wtf/HashMap.h>
     30 #include <wtf/UnusedParam.h>
     31 
     32 namespace WebCore {
     33 
     34 typedef HashMap<Attribute*, Attr*> AttributeAttrMap;
     35 static AttributeAttrMap& attributeAttrMap()
     36 {
     37     DEFINE_STATIC_LOCAL(AttributeAttrMap, map, ());
     38     return map;
     39 }
     40 
     41 PassRefPtr<Attribute> Attribute::clone() const
     42 {
     43     return adoptRef(new Attribute(m_name, m_value, m_isMappedAttribute, m_styleDecl.get()));
     44 }
     45 
     46 Attr* Attribute::attr() const
     47 {
     48     if (m_hasAttr) {
     49         ASSERT(attributeAttrMap().contains(const_cast<Attribute*>(this)));
     50         return attributeAttrMap().get(const_cast<Attribute*>(this));
     51     }
     52 
     53     ASSERT(!attributeAttrMap().contains(const_cast<Attribute*>(this)));
     54     return 0;
     55 }
     56 
     57 PassRefPtr<Attr> Attribute::createAttrIfNeeded(Element* e)
     58 {
     59     RefPtr<Attr> r;
     60     if (m_hasAttr) {
     61         ASSERT(attributeAttrMap().contains(this));
     62         r = attributeAttrMap().get(this);
     63     } else {
     64         ASSERT(!attributeAttrMap().contains(this));
     65         r = Attr::create(e, e->document(), this); // This will end up calling Attribute::bindAttr.
     66         ASSERT(attributeAttrMap().contains(this));
     67     }
     68 
     69     return r.release();
     70 }
     71 
     72 void Attribute::bindAttr(Attr* attr)
     73 {
     74     ASSERT(!m_hasAttr);
     75     ASSERT(!attributeAttrMap().contains(this));
     76     attributeAttrMap().set(this, attr);
     77     m_hasAttr = true;
     78 }
     79 
     80 void Attribute::unbindAttr(Attr* attr)
     81 {
     82     ASSERT(m_hasAttr);
     83     ASSERT(attributeAttrMap().contains(this));
     84     ASSERT_UNUSED(attr, attributeAttrMap().get(this) == attr);
     85     attributeAttrMap().remove(this);
     86     m_hasAttr = false;
     87 }
     88 
     89 } // namespace WebCore
     90